#include <assert.h>
#include <setjmp.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>

#include "CuTest.h"

/*-------------------------------------------------------------------------*
 * CuStr
 *-------------------------------------------------------------------------*/

char *CuStrAlloc(int size) {
    char *newStr = (char *) malloc(sizeof(char) * (size));
    return newStr;
}

char *CuStrCopy(const char *old) {
    int len = strlen(old);
    char *newStr = CuStrAlloc(len + 1);
    strcpy(newStr, old);
    return newStr;
}

/*-------------------------------------------------------------------------*
 * CuString
 *-------------------------------------------------------------------------*/

void CuStringInit(CuString *str) {
    str->length = 0;
    str->size = STRING_MAX;
    str->buffer = (char *) malloc(sizeof(char) * str->size);
    str->buffer[0] = '\0';
}

CuString *CuStringNew(void) {
    CuString *str = (CuString *) malloc(sizeof(CuString));
    str->length = 0;
    str->size = STRING_MAX;
    str->buffer = (char *) malloc(sizeof(char) * str->size);
    str->buffer[0] = '\0';
    return str;
}

void CuStringDelete(CuString *str) {
    if (!str) return;
    free(str->buffer);
    free(str);
}

void CuStringResize(CuString *str, int newSize) {
    str->buffer = (char *) realloc(str->buffer, sizeof(char) * newSize);
    str->size = newSize;
}

void CuStringAppend(CuString *str, const char *text) {
    int length;

    if (text == NULL) {
        text = "NULL";
    }

    length = strlen(text);
    if (str->length + length + 1 >= str->size)
        CuStringResize(str, str->length + length + 1 + STRING_INC);
    str->length += length;
    strcat(str->buffer, text);
}

void CuStringAppendChar(CuString *str, char ch) {
    char text[2];
    text[0] = ch;
    text[1] = '\0';
    CuStringAppend(str, text);
}

void CuStringAppendFormat(CuString *str, const char *format, ...) {
    va_list argp;
    char buf[HUGE_STRING_LEN];
    va_start(argp, format);
    vsprintf(buf, format, argp);
    va_end(argp);
    CuStringAppend(str, buf);
}

void CuStringInsert(CuString *str, const char *text, int pos) {
    int length = strlen(text);
    if (pos > str->length)
        pos = str->length;
    if (str->length + length + 1 >= str->size)
        CuStringResize(str, str->length + length + 1 + STRING_INC);
    memmove(str->buffer + pos + length, str->buffer + pos, (str->length - pos) + 1);
    str->length += length;
    memcpy(str->buffer + pos, text, length);
}

/*-------------------------------------------------------------------------*
 * CuTest
 *-------------------------------------------------------------------------*/

void CuTestInit(CuTest *t, const char *name, TestFunction function) {
    t->name = CuStrCopy(name);
    t->failed = 0;
    t->ran = 0;
    t->message = NULL;
    t->function = function;
    t->jumpBuf = NULL;
}

CuTest *CuTestNew(const char *name, TestFunction function) {
    CuTest *tc = CU_ALLOC(CuTest);
    CuTestInit(tc, name, function);
    return tc;
}

void CuTestDelete(CuTest *t) {
    if (!t) return;
    free(t->name);
    free(t);
}

void CuTestRun(CuTest *tc) {
    jmp_buf buf;
    tc->jumpBuf = &buf;
    if (setjmp(buf) == 0) {
        tc->ran = 1;
        (tc->function)(tc);
    }
    tc->jumpBuf = 0;
}

static void CuFailInternal(CuTest *tc, const char *file, int line, CuString *string) {
    char buf[HUGE_STRING_LEN];

    sprintf(buf, "%s:%d: ", file, line);
    CuStringInsert(string, buf, 0);

    tc->failed = 1;
    tc->message = string->buffer;
    if (tc->jumpBuf != 0) longjmp(*(tc->jumpBuf), 0);
}

void CuFail_Line(CuTest *tc, const char *file, int line, const char *message2, const char *message) {
    CuString string;

    CuStringInit(&string);
    if (message2 != NULL) {
        CuStringAppend(&string, message2);
        CuStringAppend(&string, ": ");
    }
    CuStringAppend(&string, message);
    CuFailInternal(tc, file, line, &string);
}

void CuAssert_Line(CuTest *tc, const char *file, int line, const char *message, int condition) {
    if (condition) return;
    CuFail_Line(tc, file, line, NULL, message);
}

void CuAssertStrEquals_LineMsg(CuTest *tc, const char *file, int line, const char *message,
                               const char *expected, const char *actual) {
    CuString string;
    if ((expected == NULL && actual == NULL) ||
        (expected != NULL && actual != NULL &&
         strcmp(expected, actual) == 0)) {
        return;
    }

    CuStringInit(&string);
    if (message != NULL) {
        CuStringAppend(&string, message);
        CuStringAppend(&string, ": ");
    }
    CuStringAppend(&string, "expected <");
    CuStringAppend(&string, expected);
    CuStringAppend(&string, "> but was <");
    CuStringAppend(&string, actual);
    CuStringAppend(&string, ">");
    CuFailInternal(tc, file, line, &string);
}

void CuAssertIntEquals_LineMsg(CuTest *tc, const char *file, int line, const char *message,
                               int expected, int actual) {
    char buf[STRING_MAX];
    if (expected == actual) return;
    sprintf(buf, "expected <%d> but was <%d>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}

void CuAssertLongIntEquals_LineMsg(CuTest *tc, const char *file, int line, const char *message,
                                   long int expected, long int actual) {
    char buf[STRING_MAX];
    if (expected == actual) return;
    sprintf(buf, "expected <%ld> but was <%ld>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}

void CuAssertDblEquals_LineMsg(CuTest *tc, const char *file, int line, const char *message,
                               double expected, double actual, double delta) {
    char buf[STRING_MAX];
    if (fabs(expected - actual) <= delta) return;
    sprintf(buf, "expected <%f> but was <%f>", expected, actual);

    CuFail_Line(tc, file, line, message, buf);
}

void CuAssertPtrEquals_LineMsg(CuTest *tc, const char *file, int line, const char *message,
                               const void *expected, const void *actual) {
    char buf[STRING_MAX];
    if (expected == actual) return;
    sprintf(buf, "expected pointer <0x%p> but was <0x%p>", expected, actual);
    CuFail_Line(tc, file, line, message, buf);
}


/*-------------------------------------------------------------------------*
 * CuSuite
 *-------------------------------------------------------------------------*/

void CuSuiteInit(CuSuite *testSuite) {
    testSuite->count = 0;
    testSuite->failCount = 0;
    memset(testSuite->list, 0, sizeof(testSuite->list));
}

CuSuite *CuSuiteNew(void) {
    CuSuite *testSuite = CU_ALLOC(CuSuite);
    CuSuiteInit(testSuite);
    return testSuite;
}

void CuSuiteDelete(CuSuite *testSuite) {
    unsigned int n;
    for (n = 0; n < MAX_TEST_CASES; n++) {
        if (testSuite->list[n]) {
            CuTestDelete(testSuite->list[n]);
        }
    }
    free(testSuite);

}

void CuSuiteAdd(CuSuite *testSuite, CuTest *testCase) {
    assert(testSuite->count < MAX_TEST_CASES);
    testSuite->list[testSuite->count] = testCase;
    testSuite->count++;
}

void CuSuiteAddSuite(CuSuite *testSuite, CuSuite *testSuite2) {
    int i;
    for (i = 0; i < testSuite2->count; ++i) {
        CuTest *testCase = testSuite2->list[i];
        CuSuiteAdd(testSuite, testCase);
    }
}

void CuSuiteRun(CuSuite *testSuite) {
    int i;
    for (i = 0; i < testSuite->count; ++i) {
        CuTest *testCase = testSuite->list[i];
        CuTestRun(testCase);
        if (testCase->failed) { testSuite->failCount += 1; }
    }
}

void CuSuiteSummary(CuSuite *testSuite, CuString *summary) {
    int i;
    for (i = 0; i < testSuite->count; ++i) {
        CuTest *testCase = testSuite->list[i];
        CuStringAppend(summary, testCase->failed ? "F" : ".");
    }
    CuStringAppend(summary, "\n\n");
}

void CuSuiteDetails(CuSuite *testSuite, CuString *details) {
    int i;
    int failCount = 0;

    if (testSuite->failCount == 0) {
        int passCount = testSuite->count - testSuite->failCount;
        const char *testWord = passCount == 1 ? "test" : "tests";
        CuStringAppendFormat(details, "OK (%d %s)\n", passCount, testWord);
    } else {
        if (testSuite->failCount == 1)
            CuStringAppend(details, "There was 1 failure:\n");
        else
            CuStringAppendFormat(details, "There were %d failures:\n", testSuite->failCount);

        for (i = 0; i < testSuite->count; ++i) {
            CuTest *testCase = testSuite->list[i];
            if (testCase->failed) {
                failCount++;
                CuStringAppendFormat(details, "%d) %s: %s\n",
                                     failCount, testCase->name, testCase->message);
            }
        }
        CuStringAppend(details, "\n!!!FAILURES!!!\n");

        CuStringAppendFormat(details, "Runs: %d ", testSuite->count);
        CuStringAppendFormat(details, "Passes: %d ", testSuite->count - testSuite->failCount);
        CuStringAppendFormat(details, "Fails: %d\n", testSuite->failCount);
    }
}
